Golems you control have menace.
Unyielding Titan can't attack or block unless you control three or more Golems.
Whenever Unyielding Titan enters or attacks, target opponent reveals their hand. Exile a nonland card from their hand or graveyard.
{3}, {T}: Create a 1/1 white Golem creature token.

Menace
When Reaper of the Deep enters, mill two cards. You may repeat this process until there are seven or more cards in your graveyard.
Surface {5}{B}{B}

Flying
Whenever Molten Slagmaw enters or attacks, each opponent sacrifices an artifact or nonbasic land.

When this creature dies, it deals 3 damage to any target.
Cycling {B/R}

Double strike, menace
Ward—Sacrifice a creature.
Whenever Vijkstra attacks, sacrifice a creature.

Ward {3}
Daunting Snapper can't be blocked by creatures with power 2 or less.

All spells cost {1} more to cast.
Spellcharge 6

Hexproof from permanents

Whenever Devourer of Fortunes enters or attacks, return up to one target instant or sorcery card in a graveyard or creature on the battlefield to its owner's hand. You may cast a copy of it, and may spend mana of any type to cast it.

Flash
This spell costs {1} less to cast for each permanent with flash you control and each instant card in your graveyard.
Ward {2}

Trample
Damned — Whenever this creature enters or attacks, if you've sacrificed a permanent this turn, this creature deals 3 damage to any target and you gain 3 life.

At the beginning of combat on your turn, you may integrate another creature you control. If you don't, tap Xavvac, Corrupter Core.
Permanents you control with cards integrated onto them have lifelink and deathtouch.

Trample
Landfall — Whenever a land you control enters, target creature blocks Brick Breaker this turn if able.

Reach
Surface {4}{G}{G}

Trample
Amity — Whenever Old-Growth Gecko attacks, put a +1/+1 counter on another creature you control. If exactly one other creature attacked with it, this ability triggers three times instead.

Trample
{3}{G}: Return this card from your graveyard to the battlefield tapped with a finality counter on it.

You may pay {3} rather than this spell's mana cost. If you do, it enters tapped with three stun counters on it.

Flash
Ward {3}
You may reveal the second card you draw each turn as you draw it. When you do, you may cast it without paying its mana cost. If you didn't cast a spell this way, create two Treasure tokens.

Hexproof
When Dakran Shipcrusher enters, you may bless target creature.

At the beginning of your end step, if you cast no spells this turn, surveil 1.
Spellcharge 6

King of Currents can't attack unless there are six or more cards in your graveyard.
Surface {4}{U}{U}

As an additional cost to cast spells during an opponent's turn, you may pay {U} and reveal Promethean Jaxl from your hand. If you do, you get a lurk counter.
Flash
Promethean Jaxl enters tapped.
When Promethean Jaxl enters, you draw a card for each lurk counter you have, then you lose all lurk counters.

Flying
When Gereishin enters, if it was cast, you may cast a Dragon spell or a spell with mana value 6 or less from your hand without paying its mana cost.
Once during each of your turns, when you spend less mana to cast a spell than its mana value, you may have Gereishin deal damage to up to one target creature equal to the difference.

Menace
When this creature enters, it deals X damage to any target, where X is the number of tokens you control.

If you have more life than your starting life total, this spell costs {X} less to cast, where X is equal to the difference.
Trample
When Glacier Guardian enters, you may have it fight target creature you don't control.